MARINE ALGA; OP VANCOUVER ISLAND 
125 
Vancouver island, Lichtenthaler. Since the publication of 
Selchell & Gardner, 1903, the type of this species has been 
found in Herb. Harvey; it agrees with P. B.-A., No. 944. 
Platyhamnion hetebomobphum J. G. Agardh, forma 
typicum Setchell & Gardner, 1903, p. 344; P. B.-A., No. 343. 
Departure bay, on Gelidium dredged in 30-40 metres, Macoun. 
Cibamium rubbum (Huds.) Agardh. Setchell & Gardner, 
1903, p. 345. Harvey, 1853, p. 213; P. B.-A., Nos. 345, 646. 
Esquimalt, Harvey; Port Renfrew, Butler & Policy. The 
plant from Port Renfrew agrees very well with what passes for 
typical C. rubrurn in the Atlantic. 
Forma radians, Petersen, 1908, p. 82, PL VI, fig. 3. De- 
parture bay, on Agardhiella, Macoun. A very delicate form. 
Var. pacificism Collins. Setchell & Gardner, 1903, p. 345; 
P. B.-A., Nos. 893, 1747. Departure bay, Barclay sound, 
Macoun; Port Renfrew, Butler & Polley. This name was 
first used with a plant distributed in Hauck & Richter, Phy co- 
theca Universalis, No. 302. It has been in use since then, but 
as nomen nudum ; It may be described as follows: — 
Ramificatione regulariter dichotoma, dichotomiis infeme 
distantibus, supeme magis approximate, omnibus apertis; 
ramis mox incurvis, delude parallelis, sequilongis, circum- 
scriptione frondis flabellata; fronde ubique ramulis adventivis, 
crebris, brevibus, simplicibus furcatisve, obsita, ssepa ad seg- 
mentum singulum, alternatis vel saepius series breves secunda- 
tas formantibus, longitudine 5 mm. raro superantibus, interdum 
in ramos majores exeuntibus; corticatione continua ubique, 
cellularum minutarum series subdistinctas longitudinales form- 
antium; cystocarpiis ad dichotomias ramulorum, et ad dicho- 
tomias 2 vel 3 ultimas frondis formatis, involucris bene evolutis 
circumdatis; tetrasporis sine ordine in cortice immersis. 
Branching regularly dichotomous, forkings distant below, 
closer above, all wide, the branches soon incurved, becoming 
parallel, of even length, outline of frond flabellate; frond beset 
throughout with numerous short adventive branches, simple or 
forked, often on every segment, seldom exceeding 5 mm. in 
length, sometimes developing into branches of some size; corti- 
cation continuous throughout, of minute cells forming subdis- 
tinct longitudinal series; cystocarps formed at the forkings of 
